engine knock

engine knock

[′en·jən ‚näk]
(mechanical engineering)
In spark ignition engines, the sound and other effects associated with ignition and rapid combustion of the last part of the charge to burn, before the flame front reaches it. Also known as combustion knock.
References in periodicals archive ?
I do yearly checkup so before my engine knock, I go arrest the wahala.
Evaluation of the Effect of EGR on Engine Knock," SAE Technical Paper 982479, 1998, doi:10.
In a complaint to the Oil and Gas Regulatory Authority (OGRA), Honda Atlas Cars Pakistan reported high manganese content in recently upgraded 92RON (Research Octane Number), causing three major issues, namely catalyst blocking or chocking of the catalytic converter, engine knock due to low octane quality fuels and adverse human health effects of manganese and specifically blamed three leading OMCs - PSO, Total and Shell.
These cases include operating points that produce, for example, high exhaust temperatures and/or engine knock.
Due to the often early flame initiation and start of deflagration LSPI events can subsequently lead to engine knock and detonation.
Higher octane ratings in fuel are important for high performance engines to minimize engine knock.
Ricardo's mix of practical expertise and acute experimental observation gave him a formidable knowledge of subjects such as engine knock and pre-ignition, about which most others knew little at that time.
We asked automotive firms what their toughest challenges were in measurement and they said that detecting engine knock was the hardest," Downes says.
Sudani's remarks had resonance with many drivers who have been complaining about engine knock and rough engine performance, saying that suggests the state produced gasoline has a lower octane rating than officially claimed.
Whilst discussing spark-ignition knock, Heywood [15] points out that due to the highly variable nature of engine knock, fundamental definitions of knock intensity is extremely difficult to make.
The sources while quoting experts said the high level of octane present in E-10 improves the vehicles' engine performance and prevents engine knock.
Other technology used on the new engine include piston oil jets to suppress engine knock with the 10.

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